Double-core reaming drill bit
By designing a double-center reamer, eliminating the lead drill bit section, changing the crown profile, and reducing lateral vibration, the problems of cutting tooth damage and low directional efficiency caused by conventional drill bit length were solved, resulting in higher mechanical drilling speed and footage.
Patent Information
- Application Number
- CN202520273224.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-20
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-02-20
AI Technical Summary
Conventional eccentric reamers are long in length, which causes lateral vibration and vortex during drilling, making the cutting teeth prone to damage, resulting in less drilling footage, lower mechanical drilling speed, and lower directional efficiency.
Design a double-center reaming drill bit, including a drill body, a concentrically set joint, and an eccentrically set eccentric cutter blade. Eliminate the lead-eye drill bit part, shorten the drill bit length by changing the crown profile, and use an eccentric cutter blade with an inner concave part concentrically set with the drill body to reduce lateral vibration and uniformly distribute the cutting pressure on the cutting teeth.
It improves the stability and mechanical drilling speed of the drill bit, extends the life of the drill bit, and enhances the stability and efficiency of the tool face during the directional drilling process.
Smart Images
Figure CN223724527U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of drilling equipment, in particular to a double core reaming bit. BACKGROUND
[0002] The conventional eccentric reaming bit is composed of a pilot bit, a reamer and a joint, the main function of the pilot bit is to serve as a pilot tool in the drilling operation to open up a path for the subsequent drilling operation, and the main function of the reamer is to ream and trim the well wall in the drilling process to ensure that the well size meets the requirements and improve the drilling efficiency.
[0003] Since the conventional eccentric reaming bit is composed of a pilot bit, a reamer and a joint, the overall length of the bit is relatively long, and transverse vibration and vortex are often generated during drilling, which can easily cause the cutting teeth on the nose and shoulder of the bit to collide with the rock of the well wall, resulting in impact damage of the cutting teeth, less footage of the bit, low mechanical drilling speed and early scrap of the bit. SUMMARY
[0004] The utility model discloses a double core reaming bit, which solves the technical problems of the conventional eccentric reaming bit, such as long overall length, transverse vibration and vortex during drilling, impact damage of the cutting teeth, less footage of the bit and low mechanical drilling speed.
[0005] To achieve the above-mentioned purpose, the utility model provides a double core reaming bit, which comprises:
[0006] A bit body;
[0007] A joint arranged at one end of the bit body and arranged concentrically with the bit body;
[0008] An eccentric blade arranged at the bit body and located at one end of the bit body away from the joint, the eccentric blade is arranged eccentrically with the bit body, the eccentric blade is provided with cutting teeth, and the cutting teeth are distributed along one side of the eccentric blade away from the bit body.
[0009] Preferably, the cross section of the inner recess is triangular, cylindrical, trapezoidal, arc-shaped or a combination of straight lines and curves.
[0010] Preferably, the cutting teeth are composite pieces, polycrystalline diamonds or hard alloys.
[0011] Preferably, the cutting teeth are composite pieces, polycrystalline diamonds or hard alloys.
[0012] Preferably, the drill bit body is provided with an inner cavity, which is arranged concentrically with the drill bit body.
[0013] Preferably, the drill bit body is provided with a water eye, which is in communication with the inner cavity.
[0014] Preferably, the water eye is a double-bevel nozzle.
[0015] Preferably, the gauge size of the double-center reamer bit is D1, the wellbore size drilled by the double-center reamer bit is D2, and the eccentricity between the center of the eccentric blade and the center of the inner recess is A, wherein D2-D1=2A.
[0016] Preferably, the drill bit body is provided with at least one reamer body.
[0017] Preferably, the profiles of the multiple reamer bodies gradually increase in turn.
[0018] With respect to the above background art, the double-center reamer bit provided by the present application comprises a drill bit body, a joint and an eccentric blade, the joint is arranged concentrically with the drill bit body, the eccentric blade is arranged eccentrically with the drill bit body, and the inner recess of the eccentric blade is arranged concentrically with the drill bit body. By changing the crown profile of the drill bit, the pilot bit part in the conventional double-center reamer bit is cancelled, the overall length of the drill bit is greatly shortened, the stability of the drill bit in the drilling process is improved, the lateral vibration is reduced, the impact damage to the cutting teeth of the drill bit is reduced, the bit pressure distribution of the cutting teeth is uniform, the service life of the drill bit is prolonged, the penetration rate is improved, the tool face is more stable in the directional process, and the directional efficiency is high. BRIEF DESCRIPTION OF DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.
[0020] Figure 1 The cross-sectional structure schematic diagram of the double-center reamer bit provided by the embodiments of the present application;
[0021] Figure 2 The top view schematic diagram of the double-center reamer bit provided by the embodiments of the present application;
[0022] Figure 3 The schematic diagram of the double-center reamer bit provided by the embodiments of the present application in use.
[0023] Figures 1 to 3The reference signs are: 1, drill body; 2, water eye; 3, cutting tooth; 4, eccentric cutter wing; 5, inner recess; 6, joint; 7, rock; 8, core column. DETAILED DESCRIPTION
[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.
[0025] In order for those skilled in the art to better understand the utility model solutions, the utility model will be further described in detail below with reference to the drawings and specific embodiments.
[0026] The utility model provides a kind of double heart hole enlarging drill bit, by changing the crown profile structure of drill bit, the transverse vibration of drill bit can be effectively reduced, impact damage to cutting tooth 3 can be reduced, hole enlarging efficiency is high, stability is good, and mechanical drilling speed is high.
[0027] Please refer to Figures 1 to 2 The double heart hole enlarging drill bit provided by the utility model includes a drill body 1, a joint 6 and an eccentric cutter wing 4. The joint 6 is arranged at one end of the drill body 1, and the joint 6 is arranged concentrically with the drill body 1. The eccentric cutter wing 4 is arranged on the drill body 1, and the eccentric cutter wing 4 is located at the end of the drill body 1 away from the joint 6. The eccentric cutter wing 4 is arranged eccentrically with the drill body 1, and the eccentric cutter wing 4 is provided with cutting teeth 3. The cutting teeth 3 are distributed along the side of the eccentric cutter wing 4 away from the drill body 1.
[0028] The eccentric cutter wing 4 is configured to have an inner recess 5, and the inner recess 5 is arranged concentrically with the drill body 1.
[0029] The joint 6 is arranged concentrically with the drill body 1, the eccentric cutter wing 4 is arranged eccentrically with the drill body 1, and the inner recess 5 of the eccentric cutter wing 4 is arranged concentrically with the drill body 1. In the process of drilling with the double heart hole enlarging drill bit, the double heart hole enlarging drill bit rotates and drills around the center line of the joint 6-inner recess 5. Since the eccentric cutter wing 4 is arranged eccentrically, the eccentric cutter wing 4 breaks the rock 7 to realize hole enlarging drilling in the rotation process. The cutting teeth 3 break the rock 7 into smaller particles through contact and friction with the rock 7, so as to facilitate drilling.
[0030] The double-center reaming drill bit provided by the utility model changes the crown profile of the drill bit, cancels the reamer bit part in the conventional double-center drill bit, greatly shortens the overall length of the drill bit, thereby improving the stability of the drill bit in the drilling process, reducing the transverse vibration, reducing the impact damage to the cutting teeth 3, uniformly distributing the drilling pressure of the cutting teeth 3, thereby prolonging the service life of the drill bit, improving the rate of penetration and footage, and making the tool face more stable in the directional process, and improving the directional efficiency.
[0031] The joint 6 on the drill bit is a safety joint. The safety joint is a joint connected to the lowermost part of the drill pipe string during drilling in special strata or special operations in geological drilling, used to protect the upper drill pipe. It is connected by a square thread, and is the most easily removed part of the entire drill pipe string. The main function of the safety joint is to protect the upper drill pipe during drilling, ensuring the safety and smooth progress of the drilling operation.
[0032] The safety joint is widely used in the oil, natural gas, geological exploration and other industries. As an important connecting device, it can work stably in complex environments such as high temperature and high pressure, ensuring the stability and safety of the drilling operation.
[0033] Please refer to Figure 2 and Figure 3 In the embodiment, the cross section of the inner recess 5 can be triangular, cylindrical, trapezoidal, arc-shaped or a combination of straight lines and curves. It can be understood that the above does not completely summarize all the shapes of the cross section, and other shapes of the cross section can also be used as long as they are concave.
[0034] Specifically, the cutting teeth 3 are composite pieces, polycrystalline diamond or hard alloy. Polycrystalline diamond is widely used due to its extremely high hardness, and polycrystalline diamond has very good wear resistance and is suitable for drilling in hard rock layers, but has poor impact resistance and is mainly suitable for rotary drilling, but not suitable for percussion rock drilling. Hard alloy is a material with good wear resistance, and hard alloy is suitable for drilling in medium-hard rock layers, but its service life and drilling efficiency are low when drilling in hard rock layers. When used, the appropriate material of the cutting teeth 3 needs to be selected according to the specific drilling requirements and stratum conditions.
[0035] Please refer to Figure 2 The drill bit body 1 is provided with an inner cavity, and the inner cavity is coaxially arranged with the drill bit body 1.
[0036] Please refer to Figure 2 The drill bit body 1 is provided with a water eye 2, and the water eye 2 is in communication with the inner cavity. The water eye 2 helps to quickly discharge the cuttings and dust generated during drilling, avoids blockage, and ensures the efficiency and safety of drilling; the water flow helps to reduce the friction between the drill bit and the working surface, further reduces the wear, and improves the working efficiency; the water eye 2 can also ensure that the flushing fluid is uniformly distributed on the working surface of the drill bit, thereby providing better cooling and cleaning effect.
[0037] Please refer to Figure 2 In this embodiment, the water eye 2 is a double-bevel nozzle, the water eye 2 is a straight channel, and the water eye 2 is inclined. In other embodiments, the water eye 2 can also be a single-bevel nozzle, a single-arc nozzle, or a double-arc nozzle, and the specific type is not limited.
[0038] The water eye on the drill bit is set to effectively cool and remove debris during drilling operations, thereby improving the durability and efficiency of the drill bit. When setting the water eye, the following points need to be considered:
[0039] The number and location of the water eye: According to the diameter of the drill bit and the type of drilling material expected, the number and location of the water eye are determined. For larger drill bits, more water eyes may be needed to ensure adequate cooling and debris removal.
[0040] The diameter of the water eye: The diameter of the water eye should be large enough to allow water to flow smoothly, while being small enough to not affect the overall strength and stiffness of the drill bit.
[0041] Distribution of water eyes: Water eyes should be evenly distributed on the drill bit to ensure that the cooling liquid can evenly cover the working part of the drill bit, thereby providing better cooling effect.
[0042] Connection to water source: Ensure that the water eyes on the drill bit can be easily connected to the water source to continuously supply cooling liquid during drilling.
[0043] When setting the water eye, avoid damaging the working part of the drill bit, and ensure that the water eye is kept a certain distance from the working part of the drill bit to avoid affecting the drilling quality. By reasonably setting the water eye, the efficiency and safety of drilling operations can be significantly improved, and the service life of the drill bit can be extended.
[0044] Please refer to Figures 1 to 3 The drift diameter of the double-center reamer is denoted as D1, the wellbore size drilled by the double-center reamer is denoted as D2, and the eccentric distance between the center of the eccentric blade wing 4 and the center of the inner recess 5 is denoted as A, wherein D2-D1=2A.
[0045] The center of the inner recess 5 of the eccentric blade wing 4 is coaxial with the drill bit body 1 and the joint 6, the eccentric distance between the center of the eccentric blade wing 4 and the center of the inner recess 5 is A, the gauge size of the drill bit is D1, the size of the wellbore drilled by the rotary rock breaking drill is D2, and D2-D1=2A. During the drilling process of the drill bit, the drill bit rotates and drills around the connecting line of the center of the joint 6 and the inner recess 5 of the drill bit, and during the rock breaking process of the drill bit, a central rock core column 8 is formed in the stratum rock 7. Because the eccentric blade wing 4 is eccentric to the center of the drill bit rotation, the eccentric distance A exists, the rotating radius of the eccentric blade wing 4 is greater than the gauge D1 of the drill bit, the eccentric blade wing 4 breaks the rock 7 to form an enlarged wellbore D2 in the rotating process, D2-D1=2A, and thus the reaming drilling is realized.
[0046] In some embodiments, the drill bit body 1 is provided with at least one reamer body (not shown in the figure), and the reamer body is arranged on the outer side of the drill bit body 1 and is provided with cutting teeth. On the one hand, the multi-stage reamer body structure can improve the reaming rate; on the other hand, under the premise of ensuring the same reaming rate, the multi-stage reamer body structure can increase the number of cutting teeth, thereby improving the cutting tooth wear life and the service life of the drill bit.
[0047] Preferably, the profiles of the multi-stage reamer bodies gradually increase in turn, and each stage is a reaming transition, and the multi-stage reamer body can form a multi-stage stepped well bottom appearance, and the stepped transition of the well bottom rock 7 is beneficial to releasing the stress and constraint of the side of the rock 7, and the rock 7 after releasing the stress and constraint is more prone to breaking, thereby improving the rock breaking efficiency of the drill bit.
[0048] The double-center reamer bit provided by the utility model changes the crown profile of the drill bit to change the arrangement of the cutting teeth 3 of the drill bit, thereby improving the stable state of the drill bit, reducing the impact damage of the cutting teeth 3, and uniformly distributing the drilling pressure of the cutting teeth 3, so that the rate of penetration and the mechanical drilling speed of the drill bit are improved.
[0049] The processing process of the double-center reamer bit provided by the utility model is as follows:
[0050] Raw material preparation: The manufacture of the drill bit usually starts from the selection of suitable raw materials, and common materials include alloy steel, hard alloy, etc., which have good hardness and wear resistance and are suitable for drill bit manufacturing.
[0051] Preliminary forming: The raw material is cut, forged or cast, etc. to form the preliminary shape of the drill bit. This step may include heating the raw material to an appropriate temperature to facilitate shaping.
[0052] Heat treatment: In order to improve the hardness and wear resistance of the drill bit, heat treatment such as quenching and tempering process is usually required to optimize the mechanical properties of the drill bit.
[0053] Grinding and Polishing: The cutting part of the drill bit needs to be finely ground and polished to ensure it has the correct geometry and surface quality. This step is crucial for improving the cutting efficiency and lifespan of the drill bit.
[0054] Quality Inspection: During the machining process, regular quality inspections are needed, including size measurement and hardness testing, to ensure that the drill bit meets the design requirements and quality standards.
[0055] For example, when choosing hard alloy as the raw material, when the cutting tooth is polycrystalline diamond, the diamond cutting tooth is set on the drill bit involves multiple steps and considerations to ensure the performance and durability of the drill bit. Here are the main steps for setting diamond cutting teeth on a drill bit:
[0056] 1. Selecting the appropriate binder sheet: First, a binder sheet with the same diameter as the hard alloy base is selected. This sheet will be combined with diamond powder in subsequent steps to form the diamond cutting tooth.
[0057] 2. Purification: The binder sheet is placed in a high-temperature vacuum furnace for purification to remove any possible impurities and ensure the quality of the cutting tooth.
[0058] 3. Laying diamond powder: After purification, the binder sheet is placed on the hard alloy base, and then diamond powder is laid on the binder sheet. This step is to ensure that the diamond powder can fully combine with the binder sheet to form a hard cutting tooth.
[0059] 4. High-temperature and high-pressure sintering: The laid material is placed in a high-temperature metal cup and placed in a high-pressure chamber. Sintering is carried out at a temperature of 1400-1500°C and a pressure of 5.5-8.0 GPa for 10-20 minutes. This process causes the binder sheet to melt and flow and diffuse into the diamond powder, filling the pores, and finally sintering the diamond powder into diamond polycrystals and combining with the hard alloy base to form a diamond cutting tooth.
[0060] When setting the diamond cutting tooth on the drill bit, the shape and angle of the cutting tooth also need to be considered: The shape of the cutting tooth includes cylindrical or elliptical cylindrical, and the cutting surface of the cutting tooth located on the outer periphery is set with a 10-30 degree back rake angle along the radial direction. Such design helps to improve the cutting efficiency and durability of the drill bit.
[0061] Through the above steps, the diamond cutting tooth can be effectively set on the drill bit, thereby improving the performance and durability of the drill bit and meeting different drilling needs.
[0062] The double core reaming drill bit provided by the utility model is used, first, the double core reaming drill bit is connected with other drilling tools, and then is lowered into the well bottom, and then the pump is opened to circulate the drilling fluid to pressurize drilling, when the drill bit drills in the gravel-bearing stratum, the center of the inner recess 5 of the eccentric blade wing 4 in the double core reaming drill bit is coaxial with the drill bit body 1 and the joint 6, the eccentric distance between the center of the eccentric blade wing 4 and the center of the inner recess 5 is A, the drift diameter size of the drill bit is D1, the well bore size drilled by the rotary rock breaking is D2, D2-D1=2A, in the drilling process of the drill bit, the drill bit rotates and drills around the center line of the joint 6 and the inner recess 5 of the drill bit, in the rock breaking process of the drill bit, the central core column 8 is formed in the stratum rock 7, because the eccentric blade wing 4 is eccentric with the rotation center of the drill bit with the eccentric distance A, the rotation radius of the eccentric blade wing 4 is greater than the drift diameter D1 of the drill bit, the eccentric blade wing 4 breaks the rock 7 to form the enlarged well bore D2 in the rotation process, D2-D1=2A, so that the reaming drilling is realized, by changing the crown profile of the drill bit, the pilot bit part in the conventional double core drill bit is cancelled, the overall length of the drill bit is greatly shortened, so that the stability in the drilling process of the drill bit is improved, the transverse vibration is reduced, the impact damage to the cutting teeth of the drill bit can be reduced, the cutting tooth pressure distribution is uniform, so that the drill bit life is prolonged, the mechanical drilling speed and the footage are improved, in the directional process, the tool face is more stable, and the directional efficiency is high.
[0063] It should be noted that the relational terms herein such as first and second are used only to differentiate one entity from another entity, and do not necessarily require or imply that there is any such actual relationship or order between these entities.
[0064] The principles and implementation modes of the utility model are described by using specific examples in the present document, and the above example description is only used to help understand the method and core idea of the utility model. It should be pointed out that, for ordinary skilled persons in the technical field, without departing from the principles of the utility model, the utility model can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the utility model.
Claims
1. A dual core underreamer, comprising: The application relates to a double-center hole enlarging drill bit. The drill bit body comprises a drill bit body, a joint arranged at one end of the drill bit body and arranged concentrically with the drill bit body, and an eccentric blade arranged at the drill bit body and located at the end of the drill bit body away from the joint and arranged eccentrically with the drill bit body, wherein the eccentric blade is provided with cutting teeth distributed along the side of the eccentric blade away from the drill bit body. The eccentric blade is configured to have an inner recess arranged concentrically with the drill bit body. The cross section of the inner recess is triangular, cylindrical, trapezoidal, circular arc-shaped or a combination of straight lines and curves. The cutting teeth are composite pieces, polycrystalline diamonds or hard alloys.
2. The dual-gage reamer bit of claim 1, wherein, The drill bit body is provided with an inner cavity arranged concentrically with the drill bit body.
3. The dual-gage reamer bit of claim 1, wherein, The drill bit body is provided with a water eye in communication with the inner cavity.
4. The dual mandrel underreamer of claim 1, wherein, The water eye is a double-bevel water port.
5. The dual mandrel underreamer of claim 4, wherein, The gauge size of the double-center hole enlarging drill bit is denoted as D1, the size of the well hole drilled by using the double-center hole enlarging drill bit is denoted as D2, and the eccentric distance between the center of the eccentric blade and the center of the inner recess is denoted as A, wherein D2-D1=2A.
6. The dual mandrel underreamer of claim 5, wherein, The drill bit body is provided with at least one level of hole enlarging body.
7. The dual-gage reamer of any of claims 1-6, wherein, The profiles of the hole enlarging bodies gradually increase in turn.
8. The dual-gage reamer of any of claims 1-6, wherein, 9. The dual-gage reamer bit of claim 8, wherein,